Vespertinusfluid is an aesthetigender defined as "a fluid gender that feels calm and flows simply into “darkness” deep inside of the gender, only to bring other genders back out, and implement them into the main gender.1"

Subtypes

There are three subtypes of Vespertinusfluid.

Vespertinusboy: a masculine gender brought out of the dark by Vespertinusfluid. it is related to the evening and darkness

Vespertinusgirl: a feminine gender brought out of the dark by Vespertinusfluid. it is related to the evening and darkness

Vespertinusnonbinary: a nonbinary gender brought out of the dark by Vespertinusfluid. it is related to the evening and darkness

History of the term

Vespertinusfluid and its subtypes were coined on February 11, 2020 by tumblr user hawaiiaine (aka genderpotion, exosphenic, genderrose, mason-the-owlkin, atergender, beysgender, mogai-minecraft-snail, polysexualtea, aresgoesgender, thepancherryblossom). The flags were created at the same time.2